Updated March 12th, 2025
During my radiology training, I read, researched, and learned a lot of information. There are a lot of great sites out there but. However, I found it difficult to initially find the best free radiology learning webistes. Wheter you are a radiographer, medical student or radiology resident. To truly understand radiology, you need well-structured information with good cases and high-quality images. Therefore, in this article, I would like to share my favorite and best radiology websites that are free to use and provide the most valuable online radiology content.
You may also like:
- A Typical Workday in the Life of a Radiologist
- 7 Important Tips for Radiology Residents
- Pros and Cons of being a Radiologist
What Are Features of the Best Radiology Websites
Before we dive into the list of the best online radiology resources, I want to talk briefly about what I think makes a good website for learning radiology. This article only covers free sites (or sites with a large free portion), which is the main criteria for this list. There are many other good paid options (and radiology textbooks), which I may cover in a separate article. For me, the most important aspects of the best websites for learning radiology are:
- Didactically well-structured articles
- Illustrative (and optimally annotated) cases
- Clear and memorable illustrations
- Articles written or lectures presented by experts in their fields
- Additional information to medical images (history, discussion, follow up)
- Quizzes or other interactive self-tests
Of course, even the best radiology websites do not fulfill all of these points, but this is just to show the reasoning behind this selection. For now, this is my personal selection, but I plan to expand this in the future, as I’m definitely not aware of all the great free radiology sites out there. So if you think I’m missing a relevant one, feel free to contact me.
Now lets finally look at the top radiology websites:
1. Radiology Assistant
Radiology Assistant (https://radiologyassistant.nl) is one of my favourite online ressources for learning radiology. It has helped me a lot while learning for my board exam and I´m regularely using it during clinical practise. It has well structured and thoughtfully illustrated articles on various topics that are easy to read and well suited for later look up. When you read these articles, you’ll notice that the authors have really thought about how best to didactically prepare these complex topics and how to illustrate them clearly.
Features of Radiology Assistant
- Specialty: Various
- Type of content: Excellently structured articles with high quality annotated illustrations
- Well-structured articles on various radiology topics
- Highly-informative illustrations and annotations of radiological images
- Many well annotated and representative case studies
- Also available as an app
2. Radiopaedia
The wiki-based website Radiopaedia (https://radiopaedia.org) is one of the largest and most comprehensive online radiology resources. It contains information on almost every radiology topic, and its open-editing format allows medical professionals to share their knowledge and continually improve articles. In addition, there are a large number of patient cases that can be viewed in its embedded viewer, most of which also contain additional clinical information. These cases also allow for self-directed learning through online quizzes on various topics.
Features of Radiopaedia
- Specialty: Various (almost everything)
- Type of content: Wiki-type articles, cases, interactive quizzes
- More than 16,000 articles on various radiology topics
- Peer-reviewed, open-editorial format
- More than 53,000 patient cases with diagnosis and indicator of diagnostic confidence
- Interactive case quizzes
- Multiple illustrations and diagrams
3. Introduction to Radiology
Although the name suggests otherwise, Introduction to Radiology (found at https://introductiontoradiology.net/) offers more than just an introduction. This site offers well-structured interactive online tutorials on various radiologic topics from chest x-ray to cardiac MRI. You can start with any topic and work your way through from the basics of technique and image acquisition to normal anatomy and pathological findings. As a university teacher myself, I love the excellent didactic structure with carefully annotated and representative images and videos.
Features of Introduction to Radiology
- Specialty: Various
- Type of content: Interactive online tutorials
- Basics of image akquisition and technique (such as MRI sequences)
- Sophisticated annotations
- Embedded tests and questions to consolidate what was learned
4. Radiology Resident Core Lectures
The Diagnostic Radiology Resident Core Curriculum Lecture Series (https://radiologyresidentcorelectures.com/) is a series of 20-30 minute lectures designed specifically for radiology residents and presented by recognized experts in their respective fields. This series is supported by the Association of University Radiologists (AUR) with lectures specifically created for this curriculum. I personally loved this series during my board exam preparations. When I was tired reading books or articles, I watched these lectures to repeat and memorize specific topics.
Features of Radiology Resident Core Lectures
- Specialty: Various
- Type of content: 20-30 minute video lectures
- On-demand video lectures from recognized experts
- Well structured curriculum covering various topics
- Some lectures are available in multiple languages
5. MRIquestions
For a variety of questions and answers in MRI, MRIquestions.com provides well-structured and comprehensive articles in a question-answer format. From basic electromagnetism to image generation to the most complex MRI sequences, you will find detailed and easy-to-understand Q&A articles with many illustrative images, graphs, and diagrams. Whether you are starting your MRI rotation as a radiographer or radiologist, or preparing for your board exam, this is the place to find almost any technical information related to MRI.
Features of MRIquestions
- Specialty: MRI technique
- Type of content: Question-and-answer articles
- Well-structured and didactically well prepared articles
- Well-fitting schemes and illustrations
- Complex MRI topics well thought out and prepared
- Self-test quizzes
6. Pediatric Imaging
Pediatric imaging found at https://pediatricimaging.org/ is one of the most comprehensive online resources for pediatric radiology. There are currently more than 1,400 cases of more than 700 pediatric diseases. Cases can be navigated by region, disease, and differential diagnosis. They often come with additional clinical information, multimodality imaging, and even further workup, therapy, or surgical images.If you work in pediatric radiology, this is a must. However, for me (not a pediatric radiologist), this was also often a valuable resource while working in emergency radiology as they also have a lot of trauma cases (x-ray, CT).
Features of Pediatric Imaging
- Specialty: pediatric radiology, all modalitites
- Type of content: Cases
- Easy to navigate by region, disease and also differential diagnosis
- Additional clinical information
- Often full diagnostic workup of cases including treatment
7. Eurorad
Eurorad (https://www.eurorad.org) is an online radiology learning environment of the European Society of Radiology. It is based on peer-reviewed case reports that include annotated key images and additional textual information on clinical history, imaging findings, differential diagnosis and discussion. The cases cover a wide variety of radiology topics and can be searched by region, imaging technique, procedure or specialty.
Features of Eurorad
- Specialty: Various
- Type of content: Interactive cases, teaching mode
- More than 7,500 peer-reviewed patient cases
- Well structured cases with additional information
- Self-testing via “Teaching Case” mode
- Easy to search by keywords, title or area of interest
8. MedPix
MedPix® (https://medpix.nlm.nih.gov/home) is an online database of medical images from the National Library of Medicine covering a wide range of clinical topics. Cases include additional information such as patient history, differential diagnosis, follow-up, and case discussion. Due to its large number of cases it is a not to be despised competitor/addition to Radiopaedia. I regularly use it to look at some additional cases while I’m trying to find the right diagnosis in clinical practice.
Features of MedPix
- Specialty: Various
- Type of content: Medical images, cases
- More than 58,000 medical images
- More than 12,000 patient case scenarios of 9,000 topics
- Cases can be searched by diagnosis, location or categories
- Online CME credits
9. Norwich Image Interpretation Course
The Norwich Image Interpretation Course(s) found at https://www.imageinterpretation.co.uk is a valuable resource for structured learning of skeletal radiographs. Structured into twelve interactive modules, you can work through all relevant skeletal regions from hand and wrist to ankle and foot with a special module on bone tumours. Each module covers basic radiographic positioning and systemic assessment, as well as injuries and other pathologies. Upon completion of a module, you can earn a certificate per module, of which nearly 100,000 have been issued to date.
Features of Norwich Image Interpretation Course
- Specialty: Orthopedics, musculoskeletal, x-rays
- Type of content: Interactive illustrated courses, self-tests
- Twelve interavtive courses (ankle, cervical, elbow, […], tumour, wrist)
- High quality radiographs of various pathologies
- Self-tests with 20 questions for each module
- Case of the month (available after free registration)
- Pathology image gallery (available after free registration)
10. Ortho-Teaching
Orthopedic Teaching (https://www.ortho-teaching.feinberg.northwestern.edu) hosted by the Feinberg school of medicine is dedicated towards emergency diagnostic and management principles of orthopedic injuries and lesions. Various clinical cases with representative images can be accessed by anatomical region or by diagnosis. Most cases come with detailed clinical information and include not only annotated images, but also further workup and management. Although this is an orthopedic-oriented site, it is also a great resource for emergency orthopedic radiology.
Features of Ortho-Teaching
- Specialty: Orthopedic emergencies, x-rays
- Type of content: Interactive illustrated cases
- Searchable by anatomical region or diagnosis
- Extensive clinical information, management and follow-up
- Physical exam videos – orthopedic focused
11. Ultrasound Cases
As the name suggests, at https://www.ultrasoundcases.info/ you will find ultrasound cases. And you will find many of them. To date, this free online ultrasound image library is filled with more than 7,500 cases and nearly 60,000 ultrasound images and ultrasound clips. There are multiple cases for (almost) every anatomical region that can be examined by ultrasound. In addition, the interactive search and structure by anatomical region (and their pathologies) structure allows for easy navigation to your destination.
Features of Ultrasound Cases
- Specialty: Ultrasound
- Type of content: Cases
- Multiple cases for various pathologies
- High-quality images
- Cases often come with additional clinical information
12. LinesTubes
LinesTubes.com – Chest X-Ray Lines, Tubes, and Devices definitely had my back when I was reading my first chest x-rays. It is rare to find a chest x-ray without a line, tube, or device, especially if they were send from the ICU. This brilliant website allows you to navigate by region on your chest x-ray to identify the line, tube, or device that looks similar to the one you’re trying to name on the image you’re reading. Whether it be different types of pacemakers, shunts, or other implants, they have you covered. Especially for residents starting to read ICU chest x-rays, this is a site that should always be open in a tab in your browser.
Features of LinesTubes
- Specialty: Chest x-rays
- Type of content: Images with short description
- Structured by region on chest x-ray
- Covering a wide variety of devices, tubes and lines visible on chest x-rays
The Best Radiology Websites (for Free) – the Conclusion
To wrap it up, there are a lot of great free radiology websites out there and I hope that you found one, you did not know about. Of course, this list is not exhaustive and I may add more over time. If you think a relevant source is missing, please do not hesitate to contact me.
Also read: The most impactful Radiology Journals.
Happy reporting!
